190 citations · 1.1k across the 15 of their papers we have counts for
15 papers
Electrical tunability of terahertz nonlinearity in graphene
Sergey Kovalev, Hassan A. Hafez, Klaas-Jan Tielrooij +15
Graphene is conceivably the most nonlinear optoelectronic material. Its nonlinear optical coefficients in the terahertz (THz) frequency range surpass those of other materials by ma…
Efficient terahertz optical filtering with large-area all-metal and polymer-metal woven wire meshes
Simon Rossel, Wentao Zhang, Hassan A. Hafez +2
Many components for terahertz (THz) optical filtering are mechanically fragile and are hard to produce with large aperture, making them unsuitable for applications where larger THz…
Post-2000 Nonlinear Optical Materials and Measurements: Data Tables and Best Practices
Nathalie Vermeulen, Daniel Espinosa, Adam Ball +19
In its 60 years of existence, the field of nonlinear optics has gained momentum especially over the past two decades thanks to major breakthroughs in material science and technolog…
Disentangling complex current pathways in a metallic Ru/Co bilayer nanostructure using THz spectroscopy
Nicolas S. Beermann, Savio Fabretti, Karsten Rott +3
Many modern spintronic technologies, such as spin valves, spin Hall applications, and spintronic THz emitters, are based on electrons crossing buried internal interfaces within met…
Rigorous Signal Reconstruction in Terahertz Emission Spectroscopy
Wentao Zhang, Dmitry Turchinovich
Terahertz (THz) emission spectroscopy is a powerful method that allows one to measure the ultrafast dynamics of polarization, current, or magnetization in a material based on THz e…
Grating-graphene metamaterial as a platform for terahertz nonlinear photonics
Jan-Christoph Deinert, David Alcaraz Iranzo, Raul Perez +14
Nonlinear optics is an increasingly important field for scientific and technological applications, owing to its relevance and potential for optical and optoelectronic technologies.…
Thickness-dependent electron momentum relaxation times in iron films
K. L. Krewer, W. Zhang, J. Arabski +4
Terahertz time-domain conductivity measurements in 2 to 100 nm thick iron films resolve the femtosecond time delay between applied electric fields and resulting currents. This curr…
Terahertz signatures of ultrafast Dirac fermion relaxation at the surface of topological insulators at room temperature
S. Kovalev, K. -J. Tielrooij, J. -C. Deinert +13
Topologically-protected surface states present rich physics and promising spintronic, optoelectronic and photonic applications that require a proper understanding of their ultrafas…
Thickness-dependent electron momentum relaxation times in thin iron films
Keno L. Krewer, Wentao Zhang, Jacek Arabski +4
Terahertz time-domain conductivity measurements in 2 to 100 nm thick iron films resolve the femtosecond time delay between applied electric fields and resulting currents. This resp…
The ultrafast dynamics and conductivity of photoexcited graphene at different Fermi energies
A. Tomadin, S. M. Hornett, H. I. Wang +10
For many of the envisioned optoelectronic applications of graphene it is crucial to understand the sub-picosecond carrier dynamics immediately following photoexcitation, as well as…
Out-of-plane heat transfer in van der Waals stacks: electron-hyperbolic phonon coupling
K. J. Tielrooij, N. C. H. Hesp, A. Principi +20
Van der Waals heterostructures have emerged as promising building blocks that offer access to new physics, novel device functionalities, and superior electrical and optoelectronic…
Probing the Charge Separation Process on In2S3/Pt-TiO2 Nanocomposites for Boosted Visible-light Photocatalytic Hydrogen Production
Fenglong Wang, Zuanming Jin, Yijiao Jiang +5
A simple refluxing wet-chemical approach is employed for fabricating In2S3/Pt-TiO2 heterogeneous catalysts for hydrogen generation under visible light irradiation. When the mass ra…
Competing Ultrafast Energy Relaxation Pathways in Photoexcited Graphene
Soeren A. Jensen, Zoltan Mics, Ivan Ivanov +5
For most optoelectronic applications of graphene a thorough understanding of the processes that govern energy relaxation of photoexcited carriers is essential. The ultrafast energy…
Self-phase modulation of a single-cycle terahertz pulse by nonlinear free-carrier response in a semiconductor
Dmitry Turchinovich, Jørn M. Hvam, Matthias C. Hoffmann
We demonstrate the self-phase modulation (SPM) of a single-cycle THz pulse in a semiconductor, using bulk n-GaAs as a model system. The SPM arises from the heating of free electron…
Semiconductor saturable absorbers for ultrafast THz signals
Matthias C. Hoffmann, Dmitry Turchinovich
We demonstrate saturable absorber behavior of n-type semiconductors GaAs, GaP and Ge in THz frequency range at room temperature using nonlinear THz spectroscopy. The saturation mec…